Re: Microsoft and the two great blunders
Date: 24 Dec 2003 04:38:44 -0800
Costin Cozianu <c_cozianu_at_hotmail.com> wrote in message news:<bsavog$bg13t$1_at_ID-152540.news.uni-berlin.de>...
> those relvar. But to make it clear we'll call them table, shall we ?
> Now let's further consider that the table EMPLOYEE stores all the tuples
> that have the type EMPLOYEE%ROWTYPE (using SQL terms, i.e. the type of
> the tuples).
> Quite nice. But according to D&D types are sets of values. Well, then a
> relation is a set of value.
According to D&D and many other people, types can be viewed as sets of values associated to sets of operators. On the other hand, a relation is an individual constant. But the "great blunder" is to confuse types with relation variables, not whith relations (values). Another common mistake is to confuse values with variables all the time.
According to D&D too.
> For lack of better things to do, people think that if they throw
> Microsoft and a couple of relational orthodoxy together, they've got a
> valid point.
Alfredo Received on Wed Dec 24 2003 - 13:38:44 CET